The Contrast Low Osmolar is identified by number "1" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B21F1
Fluoroscopy of Other Bypass Graft using Other Contrast
Fluoroscopy of Other Bypass Graft using Low Osmolar Contrast
Fluoroscopy of Other Bypass Graft using H Osm Contrast